Re: Low cost Servo Controller

Hello Jon,

I have been quite a while lurking all the information about the low cost
servo controller because i have plans to add a bridgeport mill to my
homeshop and convert it to EMC.
I have already made a stepper controlled mill but it is not stiff (strong)
enough for cutting steel.

Just like Bertho Boman I like to sign the non-disclosure and take a look at
what you got.

Frank
Hilvarenbeek, Holland


PS: Thanks for your information about building an EDM machine. I am still
gathering information.



----- Oorspronkelijk bericht -----
Van: Bertho Boman <boman@...>
Aan: <CAD_CAM_EDM_DRO@onelist.com>
Verzonden: woensdag 15 september 1999 4:09
Onderwerp: Re: [CAD_CAM_EDM_DRO] Low cost Servo Controller

> From: Bertho Boman <boman@...>
>
> Hello Jon,
> I like to sign the non-disclosure and take a look at what you got.
>
> I like your operating mode and wish you best of luck.
>
> Bertho Boman
> =======================================
>
> From: Jon Elson <jmelson@...
>
> > I have let a group of people use my design, and after signing a

non-disclosure

> > agreement, I send schematics, board layouts, circuit theory and tune-up
> > procedures. I think for the next batch, I'm going to raise prices just

a

> > little, to cover the mailing costs, which I underestimated the first

time

> > around. So, the board, with some small components that would be hard to
> > get in small quantity, plus a pot core transformer and wire to wind it

with

> > will go fo US $64 each. The total cost, including these parts, should

come

> > to a little under US $200 per amp. Nothing is really very expensive in
> > there, but it all just adds up. There are 3 CMOS digital ICs, about 5
> > assorted op-amps, 2 LED bar graphs and their drivers, 2 FET driver
> > chips and 4 power FETS. I usually use IRF640s, but depending on
> > voltage and current requirements, others could be used. You could
> > also use IGBT transistors, although lowering the PWM frequency might
> > be required for them. I usually use 100 KHz as the PWM freq.
> > just to keep the filter components small.
> >
> > The whole amp fits on a 4.5 x 6" (115 x 150 mm) circuit card, with
> > small stamped sheet metal heat sinks for the transistors.
> >
> > Jon
>
>
> --------------------------- ONElist Sponsor ----------------------------
>
> GRAB THE GATOR! FREE SOFTWARE DOES ALL THE TYPING FOR YOU!
> Tired of filling out forms and remembering passwords? Gator fills in
> forms and passwords with just one click! Comes with $50 in free coupons!
> http://www.onelist.com/ad/gator1
>
> ------------------------------------------------------------------------
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems in the above catagories.

> To Unsubscribe, read archives, change to or from digest.
> Go to: http://www.onelist.com/isregistered.cgi
> Log on, and you will go to Member Center, and you can make changes there.
> For the FAQ, go to http://www.ktmarketing.com/faq.html
> bill,
> List Manager
>